pgpl/src/gui/widgets/button.c

#include <pgpl.h>
#include <stdlib.h>

static void get_content_size(PGPL_GuiWidget *widget, PGPL_GuiTheme *theme,
                             double *width, double *height, double max_width,
                             double max_height) {
  PGPL_GuiButtonWidget *button_widget = (PGPL_GuiButtonWidget *)widget;
  PGPL_Rectangle rect;

  (void)max_width;
  (void)max_height;

  pgpl_font_string_dimensions(theme->font, button_widget->text,
                              theme->font_size[widget->font_size], &rect);

  *width = rect.right - rect.left;
  *height = rect.bottom - rect.top;
}

static void render_content(PGPL_GuiWidget *widget, PGPL_Renderer *renderer,
                           PGPL_GuiTheme *theme, double x, double y,
                           double max_width, double max_height) {
  PGPL_GuiButtonWidget *button_widget = (PGPL_GuiButtonWidget *)widget;

  (void)max_width;
  (void)max_height;

  pgpl_font_render_string(renderer, theme->font, button_widget->text,
                          theme->text_color[widget->gui_color], x, y,
                          theme->font_size[widget->font_size]);
}

static void event(PGPL_GuiWidget *widget, PGPL_GuiTheme *theme, PGPL_Gui *gui,
                  PGPL_WindowEventType event_type,
                  PGPL_WindowEventData *event_data, double x, double y,
                  double max_width, double max_height) {
  PGPL_GuiButtonWidget *button_widget = (PGPL_GuiButtonWidget *)widget;

  if (event_type == PGPL_WINDOW_EVENT_MOUSE_PRESS ||
      event_type == PGPL_WINDOW_EVENT_MOUSE_RELEASE ||
      event_type == PGPL_WINDOW_EVENT_MOUSE_MOVE) {
    if (pgpl_gui_widget_within_bounds(widget, theme, x, y, max_width,
                                      max_height, event_data->input_event.x,
                                      event_data->input_event.y)) {
      if (event_type == PGPL_WINDOW_EVENT_MOUSE_PRESS &&
          event_data->input_event.key == PGPL_WINDOW_MOUSE_BUTTON_LEFT) {
        widget->gui_color = PGPL_GUI_STATUS_COLOR_ACTIVE;
      } else if (event_type == PGPL_WINDOW_EVENT_MOUSE_RELEASE &&
                 event_data->input_event.key == PGPL_WINDOW_MOUSE_BUTTON_LEFT) {
        if (widget->gui_color == PGPL_GUI_STATUS_COLOR_ACTIVE) {
          button_widget->click_callback(gui->app_data);
        }
        widget->gui_color = PGPL_GUI_STATUS_COLOR_HOVER;
      } else {
        if (widget->gui_color != PGPL_GUI_STATUS_COLOR_ACTIVE) {
          widget->gui_color = PGPL_GUI_STATUS_COLOR_HOVER;
        }
      }
    } else {
      widget->gui_color = PGPL_GUI_STATUS_COLOR_NORMAL;
    }
  }
}

static void destroy(PGPL_GuiWidget *widget) {
  pgpl_gui_button_widget_destroy((PGPL_GuiButtonWidget *)widget);
}

PGPL_GuiButtonWidget *
pgpl_gui_button_widget_create(const char *text,
                              void (*click_callback)(void *app_data)) {
  PGPL_GuiButtonWidget *button_widget = calloc(1, sizeof(*button_widget));
  pgpl_gui_widget_default_config(&button_widget->parent);
  button_widget->parent.id = "PGPL_GuiButtonWidget";
  button_widget->parent.get_content_size = get_content_size;
  button_widget->parent.render_content = render_content;
  button_widget->parent.event = event;
  button_widget->parent.destroy = destroy;
  button_widget->text = text;
  button_widget->click_callback = click_callback;
  return button_widget;
}

void pgpl_gui_button_widget_destroy(PGPL_GuiButtonWidget *button_widget) {
  free(button_widget);
}